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Mr. Tretbar is a vastly experienced professional geologist having previously acted as Chief Geologist at Sumitomo’s Minera San Cristóbal Mine in Bolivia, Senior Exploration Geologist for Alamos Gold at the Mulatos Mine in Mexico, Mill Manager of the Ashdown Molybdenum Mine in Nevada, and as Process Mineralogist for Barrick’s Goldstrike Operation in Nevada.

More recently, Mr. Tretbar was Vice President of Exploration and Mineral Resources for Denver-based Summit Mining International, the US subsidiary of Sumitomo Corporation in Japan. From 2010 until 2022, when Sumitomo closed their US subsidiary, Mr. Tretbar’s duties with Summit included new business development, technical evaluations, and providing exploration and operations support to Sumitomo’s global mineral program.

Mr. Tretbar holds a Bachelor of Science degree from Northern Arizona University and a Master of Science degree in Geochemistry from the Mackay School on Mines, University of Nevada, Reno. He is a Registered Professional Geologist in the state of Arizona and Certified Professional Geologist through the American Institute of Professional Geologists. Mr. David Tretbar joined the Lion One board in June 2020.